Update rx_bloc_cli to exclude generated files from version control #2562

Job	Run time
cli_packages (packages/rx_bloc_cli)	2m 23s
examples (examples/booking_app)	2m 37s
examples (examples/counter)	1m 50s
examples (examples/division)	1m 39s
flutter_packages (packages/rx_bloc_list)	3m 11s
examples (examples/favorites_advanced/rx_bloc_favorites_advanced)	2m 8s
flutter_packages (packages/flutter_rx_bloc)	3m 17s
examples (examples/todoapp)	3m 7s
packages (packages/rx_bloc)	2m 8s
packages (packages/rx_bloc_test)	2m 28s
packages (packages/rx_bloc_generator)	3m 31s
build	1s
	28m 20s

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